EP0338512B1 - Engine driven generator - Google Patents
Engine driven generator Download PDFInfo
- Publication number
- EP0338512B1 EP0338512B1 EP89106938A EP89106938A EP0338512B1 EP 0338512 B1 EP0338512 B1 EP 0338512B1 EP 89106938 A EP89106938 A EP 89106938A EP 89106938 A EP89106938 A EP 89106938A EP 0338512 B1 EP0338512 B1 EP 0338512B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- generator
- inverter
- phase
- engine
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1469—Regulation of the charging current or voltage otherwise than by variation of field
- H02J7/1492—Regulation of the charging current or voltage otherwise than by variation of field by means of controlling devices between the generator output and the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/009—Circuit arrangements for detecting rotor position
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/08—Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
Definitions
- the present invention relates to an engine driven generator having a synchronous generator to be used as an engine starter when the engine is actuated, as known from EP-A1-0 260 176.
- the first embodiment of the engine driven generator has an arrangement capable of producing a single-phase alternating current with use of the three-phase synchronous generator.
- the engine driven generator of the first embodiment comprises an engine 1, a generator 3 (three-phase synchronous generator) connected to the engine 1 by a shaft, a rotor position detector 10 composed of for example, magnetic resistance element or a proximity switch of a search coil, having a characteristic to detect at least 120 magnetic pole electrical angle, and connected to the generator 3 by a shaft, a full-wave three-phase rectifier 11 composed of six diodes D1 made in bridge connection and having a rectified output to be supplied to a main circuit of a direct current/alternating current power converter 13 (voltage inverter to be controlled by three-phase PWM control, hence hereafter referred to simply as inverter) and input terminals of the rectifier 11 each connected to free ends of three wirings 3u, 3v, 3w of armatures of the generator 3, a switching unit 12 having a switch 12A and a switch 12B composed of normally open contact Saw, normally closed contacts Sbv, Sbu connected to the output terminals of the main circuit of the inverter 13 composed of six switching elements Tr and
- the rotor position detector 10 can be substituted by that of operation fixed type capable of obviating a shaft connection with the generator 3 for integrating the output voltage of the generator 3 to detect the magnetic pole position.
- the switch 12A connect or disconnect the output terminals u, v of the main circuit of the inverter 13 to or from output terminals of loads (not shown) while the contacts Saw connect or disconnect the output terminal v to or from the output terminal w, and the conatct Sbu, Sbv connect or disconnect the output terminals u, v to or from input terminals corresponding thereto of the full-wave rectifier 11.
- the output terminal w and an input teminal corresponding thereto of the full-wave rectifier 11 are directly connected with each other.
- the six switchig elements Tr of the main circuit of the inverter 13 have for example, U-phase transistors T PU , T NU , V-phase transistor T PV , T NV , and W-phase transistors T PW , T NW .
- the output terminals u, v, of the main circuit of the inverter 13 are connected with output terminals of the outer device via the switch 12A of the switching unit 12 while connected to the full-wave rectifier 11 via the switch 12B of the switching unit 12.
- the control circuit 19 (Fig. 2) comprises a control power supply 20 for receiving a power of the direct current power supply 15 and produces a direct current power for control, an actuation completion detector 21 for receiving the output ⁇ of the rotor position detector 10 for producing and supplying a switching signal S to the switching unit 12, a first drive unit 22B for receiving the output ⁇ of the rotor position detector 10 in the case where the switching signal S is not supplied for detecting the relative position between the magnetic pole and the armature of the generator 3 and producing drive signal I B and supplying the drive signal I B to the transistors Tr of the main circuit of the inverter 13, and a second drive unit 22A for controlling the output voltage of the main circuit of the inverter 13 by feedbacking the output voltages U, V, W of the main circuit of the inverter 13 at the time when the actuation completion detector 21 produces the switching signal S.
- the control power supply 20 comprises a capacitance C, a voltage stabilizing elements Z1, Z2 respectively connected with each other and with the capacitance C, and a rectifier D3 connected to the voltage stabilizing element Z2 as illustrated in Fig. 3.
- the rotor position detector 10 receives a power from the control power supply 20.
- the actuation completion detector 21 comprises a pulse generator PG for generating six-times pulse on the basis of the output of the rotor position detector 10, a frequency/voltage converter (F/V converter) for generating voltage proportional to the speed of rotation of the generator 3, and a comparator CP for comparing the output vn of the F/V converter with a predetermined level vno (a value corresponding to the speed of rotation N o ) and detecting the switching signal S in the case where the output vn is greater than the predetermined level vno at the result of the comparison as illustrated in Fig. 4.
- a pulse generator PG for generating six-times pulse on the basis of the output of the rotor position detector 10
- F/V converter frequency/voltage converter
- CP for comparing the output vn of the F/V converter with a predetermined level vno (a value corresponding to the speed of rotation N o ) and detecting the switching signal S in the case where the output vn is greater than the
- the second drive unit 22A has a signal generator 23 for receiving the three-phase output of the main circuit of the inverter 13 and producing a signal SIN which is a rectified voltage of a basic wave (sine wave) and has a positive maximum and a negative maximum successively alternating each half cycle and a square wave signal REC (H/L signal having a basic freqency) which is synchronous with the positive and negative waves of the signal SIN and becomes H-level each half cycle of the signal SIN as illustrated in Fig. 5.
- a comparator 24 receives the signal SIN (modulation wave) and a triangular wave signal (transmission signal) produced by a triangular wave generator 25 and compares them and produces a PWM signal.
- Switching unit 26 as shown in Figs. 2 and 5 comprises U-phase switch 26u, V-phase switch 26v and W-phase switch 26w.
- the switches 26u, 26v, 26w connect the output of the first drive unit 22B to the U-phase driver 27u, the V-phase driver 27v and the W-phase driver 27w respectively of the drive unit 27 until the switching signal S is produced.
- the H/L (REC) signal is supplied to the U-phase driver 27u via the U-phase switch 26u so as to issue signals of PU, NU while the PWM signal is supplied to the V-phase driver 27v and the W-phase driver 27w via the V-phase switch 26v and the W-phase switch 26w so as to issue signals PV, NV and signals PW, NW.
- the signals PU, NU; PV, NV; PW, NW respectively constitute the drive signal I B .
- the U-phase driver 27u, the V-phase driver 27v and the W-phase driver 27W respectively receive the H/L signal as ON/OFF signal so that each driver does not issue any signal in the case where the H/L signal is at an L level.
- the waveforms showing voltages Vu, Vv, Vw (potentials at imaginary neutral point corresponding to a middle point of the serially connected resistors R1, R2 as shown in a broken line in Fig. 1) of the output terminals of the main circuit of the inverter 13 are illustrated in Fig. 6 in the case where the contact Saw of the switch 12A is closed while each of the switches 26u, 26v, 26w of the signal switching unit 26 is switched to the side of the first drive unit 22B.
- Designated at E is an input voltage of the main circuit 13 of the inverter 13 and the hatched portion shows high impedance state.
- the switching unit 12A and the contact Saw of the switch 12B are open while the contacts Sbu, Sbv of the switch 12B are closed so that output terminals u, v, w of the main circuit of the inverter 13 are connected to the armature windings 3u, 3v, 3w of the generator 3.
- the actuation switch 17 is turned on to supply the direct current power 15 to the main circuit of the inverter 13 while the main circuit of the inverter 13 receives a base signal I B supplied from the driver 27u, 27v, 27w on the basis of the signal produced by the first drive unit 22B and is actuated.
- the main circuit of the inverter 13 converts the direct current power of the direct current power source 15 to the three-phase alternating current voltages U, V, W having frequencies in synchronism with the speed of rotation N of the generator 3 and supplies it to the generator 3 whereby the generator 3 effects motor driving operation to actuate the engine 1. That is, the rotor position detector 10 and the main circuit of the inverter 13 correspond respectively to a brush and a commutator of DC motor and the generator 3 effects the motor driving operation to actuate the engine 1 as a starter.
- the speed of rotation N of the generator 3 is increased with the lapse of time after actuation of the engine 1 and reaches the predetermined speed N o .
- the engine 1 completes the actuation thereof and the actuation completion detector 21 of the control circuit 19 issues the switching signal S so that the switch 12A and the contact Saw of the switch 12B are closed while the contacts Sbu, Sbv of the switch 12B are open whereby the output terminals u, v are short-circuited and connected to the terminals (loads) of the outer device.
- the signal switching unit 26 is switched.
- the generator 3 starts to effect power generation operation.
- the voltage generated by the generator 3 is converted to direct current by the full-wave rectifier 11 and smoothed by the capacitor 14, the smoothed direct current power is supplied to the main circuit of the inverter 13.
- the main circuit of the inverter 13 effects inverting operation on the reception of the base drive signal I B supplied by the U-phase driver 27u, V-phase driver 27v, W-phase driver 27w on the basis of the signal produced by the second drive unit 22A, namely, by the H/L signal and the PWM signal.
- the transistors T PU , T NU are turned on or off in synchronism with the H/L signal while the transistors T PV , T NV effect PWM operation during the period of H-level of the H/L signal and rest at the other half cycle, and the transistors T PW , T NW effect PWM operation during the period of L-level of the H/L signal and rest at the other half cycle. That is, a pair of the transistors T PV , T NV and a pair of the transistors T PW and T NW are alternately driven each half cycle of the basic wave with time sharing.
- a transistor dissipation is classfied generally to a normal dissipation L1 at an on-state and a transient dissipation (switching dissipation) L2 at the time of switching.
- the normal dissipation L1 and the transisent dissipation L2 are in the ratio of 1:1.
- the normal dissipation L1 occupies substantially 100 % of the whole dissipation.
- the capacity of the main circuit of the inverter 13 is same, compared with the case where the transistor corresponding to one-phase rests, for example, in the case where the W-phase transistors T PW , T NW , rest completely, it is possible to supply a single-phase alternating current having output of two times.
- the output value of the single-phase alternating current is same, for example, compared with the case where the W-phase transistors T PW , T NW rest completely the capacity of the main circuit of the inverter 13 will be reduced to half which results in allowing the device to be small sized.
- the ON/OFF timing of the U-phase transistors T PU , T NU is synchronous with the operation switching timing of the transistors T PV , T NV and the transistors T PW , T NW the operations of the V-phase transistors T PV , T NV and the W-phase transistors T PW , T NW may be shifted relative to the operations of U-phase transistors T PU , T NU , as shown in Fig. 7.
- V-phase transistors T PV , T NV , and the U-phase transistors T PU , T NU are alternated with phase angle of 180° radian, but they may be alternated with phase angles of 45°, 90°, 120° radians which have same effect as that of the phase angle of 180° radian.
- V-phase transistors T PV , T NV and the W-phase transistors T PW , T NW may be alternately operated with substantially 50 percent of time sharing.
- the backflow prevention diode 16 is provided for preventing the current from flowing back since the voltage of the capacitor 14 is automatically greater than that of the direct current power supply 15 after the actuation of the engine 1.
- the engine driven generator comprises a chopper circuit 30 for increasing the voltage of the direct current power supply 15 to be supplied to the main circuit of the inverter 3 in addition to the elements same as those of the first embodiment.
- the chopper circuit 30 has a chopper 31, a reactor 32, and a chopper controller (not shown) provided at the control circuit 19 for controlling the ON/OFF period where the direct current obtained by rectification of the output voltage of the main circuit of the inverter 13 is supplied to the chopper 31 as a feedback signal.
- the chopper circuit 30 has an operation characteristic as illustrated in Fig. 9. In Fig. 9 designated at Eo is the voltage of the direct current power supply 15, Ec is the voltage of the capacitor 14.
- the chopper circuit 30 for increasing the voltage inasmuch as the input voltage of the main circuit of the inverter 13 cannot be decreased under the voltage value of the direct current power supply 15 as illustrated in Fig. 9, the speed of rotation of the generator 3 is small when the generator 3 is just actuated so that an excessive current will flow through the main circuit of the inverter 13 when the speed induction voltage is low.
- the chopper circuit 30A for increasing the voltage may be provided as illustrated in Fig. 10.
- the chopper circuit 30A comprises a chopper 31A (a transistor in this embodiment), reactor 32A, and a chopper controller (not shown) provided at the control circuit 19 for controlling the O N/OFF period where the direct current obtained by rectification of the output voltage of the main circuit of the inverter 13 is supplied to the chopper 31A as a feedback signal.
- the chopper circuit 30A decreases the voltage provided that the O N period of the transistor 31 is shortened, while the chopper circuit 30A increases the voltage provided that the ON period of the transistor 31 is prolonged.
- An operation characteristic of the chopper circuit 30A for increasing and decreasing the voltage is illustrated in Fig. 11, designated at Eo is the voltage of the direct current power supply 15, Ec is the voltage of the capacitor 14.
- the engine driven generator of the fourth embodiment is different from that of the second embodiment as illustrated in Fig. 8 in respect that the element 33 for charging the battery (a transistor in this embodiment).
- a charging controller is provided at the control circuit 19 (not shown) for controlling the transistor 33 to thereby supplying an ON signal from the charging controller at the time when the switching signal S is issued.
- the charging means or elements can be employed in the engine driven generator of the second embodiment.
- Each embodiment has the signal switching unit 26 having contacts but having gate logic switch actually mounted instead of contacts.
- the control circuit 19 is illustrated as analog structure but may be digital structure.
- the operation of the main circuit of the inverter 13 can be executed by a software.
- the control system in each embodiment can be employed to an engine driven generator having a main circuit other than the main circuit of the inverter 13.
- the generator 3 employed in the first embodiment is the three-phase synchronous generator and the main circuit of the inverter 13 is the three-phase inverter.
- the engine driven generator according to the fifth embodiment of the present invention can be used as the three-phase generator by changing the control system.
- the switching unit 12 of the first embodiment may be substituted by the three-phase switching unit as illustrated in Fig. 13 while the second drive unit 22A of the first embodiment may be substituted by a second drive unit 22C for producing a PMW signal for supplying to a U-phase driver 27u, V-phase driver 27v, W-phase driver 27w respectively of a driver unit 27.
- the contact 12A of the switching unit 12 has three normally open contacts Sau, Sav, Saw while the contact 12B has three normally closed contacts Sbu, Sbv, Sbw.
- Designated in Fig. 15 at 23u, 23v, 23w are respectively signal generators shifted for 120° in phase angle 24A, 24B, 24C are respectively comparators and 25 is a triangular wave generator.
- Designted at 18 is a transformer for feedbacking the output voltages U, V, W of the output terminals u, v, w to the control circuit 19.
- the rotor position detector 10 and the main circuit of the inverter 13 operate corresponding to the brush and the armature of the direct current motor while three-phase synchronous generator 3 carries out the motor driving operation to actuate the engine 1.
- the synchronous generator 3 carries out a generating operation and the alternating current output is converted by the main circuit of the inverter 13 to a stable three-phase alternating current power having a predetermined voltage with a predetermined frequency.
- the engine driven generator according to the first to the fourth embodiments, a mere change of the switching unit 12 as well as change of the second drive unit of the control circuit 19 to thereby change the control system such as substitution of a printer circuit enables to be employed as the three-phase generator as well as the single-phase generator.
- the bridge circuit composed of the transistor of the same capacity constituting the main circuit of the inverter 13 is general, and moduled and available with module and low cost
- the engine driven generator can be mass-produced.
- the constituents excluding the engine the synchronous generator are very simple, the engine driven generator can be realized with low cost, light weight, and compact size.
- the direct current power supply namely, the direct current power supply having the chopper circuit 30 for increasing the voltage, the direct current power supply 30A for increasing and decreasing the voltage, the direct current power supply having the battery charging element 33 respectively illustrated in Figs. 8, 10, 12 can be employed to the engine driven generator of the fifth embodiment.
- the engine driven generator having no exclusive starter with simple construction so that the engine driven generator becomes small sized, compact with easy maintenace thereof.
- one-phase of the switching element of the main circuit of the inverter for converting the output of the generator into the voltage having a predetermined voltage with a predetermined frequency is subjected to successively low frequency switching operation while the other two-phase switching elements are subjected to a high frequency switching operation alternately each half cycle whereby the main circuit can be operated with an optimum conversion efficiency at the motor driving operation of both the single-phase generator and the three-phase generator to thereby increase remarkably the single-phase alternating current capacity and to reduce the cost thereof.
Description
- The present invention relates to an engine driven generator having a synchronous generator to be used as an engine starter when the engine is actuated, as known from EP-A1-0 260 176.
- It is an object of the present invention to provide an engine driven generator suitable for supplying an ac load with electrical power from an inverter or the generator.
- According to the invention, this object is solved by the features of claim 1. Subject matter of the sub-claims are preferred embodiments of the invention.
- The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawing.
- Fig. 1 is a circuit diagram of an engine driven generator according to a first embodiment of the present invention;
- Fig. 2 is a control circuit in the circuit diagram of Fig. 1;
- Fig. 3 is a control power supply in the control circuit of Fig. 2;
- Fig. 4 is a circuit diagram illustrating starting completion detector in the control circuit of Fig. 2;
- Fig. 5 is a block diagram showing a second drive unit in the control circuit of Fig. 2;
- Fig. 6 is a voltage waveform appeared in output terminals of an inverter circuit in the circuit diagram of Fig. 1;
- Fig. 7 is a time chart of operation of U-W phase transistors;
- Fig. 8 is a circuit diagram of an engine driven generator according to a second embodiment of the present invention;
- Fig. 9 is a view showing an operation characteristic of a chopper circuit according to the circuit diagram of Fig. 8;
- Fig. 10 is a circuit diagram of an engine driven generator according to a third embodiment of the present invention;
- Fig. 11 is a view showing an operation characteristic of a chopper circuit according to the circuit diagram of Fig. 10;
- Fig. 12 is a circuit diagram of an engine driven generator according to a fourth embodiment of the present invention;
- Fig. 13 is a circuit diagram of an engine driven generator according to a fifth embodiment of the present invention;
- Fig. 14 is a block diagram showing a control circuit in the circuit diagram of Fig. 12; and
- Fig. 15 is a block diagram showing a second drive unit in the control circuit of Fig. 13.
- The first embodiment of the engine driven generator has an arrangement capable of producing a single-phase alternating current with use of the three-phase synchronous generator.
- The engine driven generator of the first embodiment comprises an engine 1, a generator 3 (three-phase synchronous generator) connected to the engine 1 by a shaft, a
rotor position detector 10 composed of for example, magnetic resistance element or a proximity switch of a search coil, having a characteristic to detect at least 120 magnetic pole electrical angle, and connected to thegenerator 3 by a shaft, a full-wave three-phase rectifier 11 composed of six diodes D1 made in bridge connection and having a rectified output to be supplied to a main circuit of a direct current/alternating current power converter 13 (voltage inverter to be controlled by three-phase PWM control, hence hereafter referred to simply as inverter) and input terminals of therectifier 11 each connected to free ends of threewirings generator 3, aswitching unit 12 having aswitch 12A and aswitch 12B composed of normally open contact Saw, normally closed contacts Sbv, Sbu connected to the output terminals of the main circuit of theinverter 13 composed of six switching elements Tr and Diodes D2 connected in parallel and opposite polarity with the switching elements Tr, acapacitor 14 interposed between the P-N terminals of direct current sides, a direct current power supply 15 (battery Ba) connected between the direct current terminals P, N of the main cuicuit of theinverter 13 via adiode 16 for preventing the current from flowing back (hereafter referred to as backflow prevention diode), an actuationmanual switch 17 connecting to the directcurrent power supply 15 at an end and a control circuit 19 (described later) at the other end, thecontrol circuit 19 for controlling the main circuit of theinverter 13 for receiving output voltages u, v, w of the main circuit of theinverter 13 and output voltage E of the directcurrent power supply 15 as well as a detection signal α(αu, αv, αw) for carring out a function described later. - The
rotor position detector 10 can be substituted by that of operation fixed type capable of obviating a shaft connection with thegenerator 3 for integrating the output voltage of thegenerator 3 to detect the magnetic pole position. - The
switch 12A connect or disconnect the output terminals u, v of the main circuit of theinverter 13 to or from output terminals of loads (not shown) while the contacts Saw connect or disconnect the output terminal v to or from the output terminal w, and the conatct Sbu, Sbv connect or disconnect the output terminals u, v to or from input terminals corresponding thereto of the full-wave rectifier 11. The output terminal w and an input teminal corresponding thereto of the full-wave rectifier 11 are directly connected with each other. - The six switchig elements Tr of the main circuit of the
inverter 13 have for example, U-phase transistors TPU, TNU, V-phase transistor TPV, TNV, and W-phase transistors TPW, TNW. The output terminals u, v, of the main circuit of theinverter 13 are connected with output terminals of the outer device via theswitch 12A of theswitching unit 12 while connected to the full-wave rectifier 11 via theswitch 12B of theswitching unit 12. - The control circuit 19 (Fig. 2) comprises a
control power supply 20 for receiving a power of the directcurrent power supply 15 and produces a direct current power for control, anactuation completion detector 21 for receiving the output α of therotor position detector 10 for producing and supplying a switching signal S to theswitching unit 12, afirst drive unit 22B for receiving the output α of therotor position detector 10 in the case where the switching signal S is not supplied for detecting the relative position between the magnetic pole and the armature of thegenerator 3 and producing drive signal IB and supplying the drive signal IB to the transistors Tr of the main circuit of theinverter 13, and asecond drive unit 22A for controlling the output voltage of the main circuit of theinverter 13 by feedbacking the output voltages U, V, W of the main circuit of theinverter 13 at the time when theactuation completion detector 21 produces the switching signal S. - The
control power supply 20 comprises a capacitance C, a voltage stabilizing elements Z1, Z2 respectively connected with each other and with the capacitance C, and a rectifier D3 connected to the voltage stabilizing element Z2 as illustrated in Fig. 3. Therotor position detector 10 receives a power from thecontrol power supply 20. Theactuation completion detector 21 comprises a pulse generator PG for generating six-times pulse on the basis of the output of therotor position detector 10, a frequency/voltage converter (F/V converter) for generating voltage proportional to the speed of rotation of thegenerator 3, and a comparator CP for comparing the output vn of the F/V converter with a predetermined level vno (a value corresponding to the speed of rotation No) and detecting the switching signal S in the case where the output vn is greater than the predetermined level vno at the result of the comparison as illustrated in Fig. 4. - The
second drive unit 22A has asignal generator 23 for receiving the three-phase output of the main circuit of theinverter 13 and producing a signal SIN which is a rectified voltage of a basic wave (sine wave) and has a positive maximum and a negative maximum successively alternating each half cycle and a square wave signal REC (H/L signal having a basic freqency) which is synchronous with the positive and negative waves of the signal SIN and becomes H-level each half cycle of the signal SIN as illustrated in Fig. 5. Acomparator 24 receives the signal SIN (modulation wave) and a triangular wave signal (transmission signal) produced by atriangular wave generator 25 and compares them and produces a PWM signal. -
Switching unit 26 as shown in Figs. 2 and 5 comprisesU-phase switch 26u, V-phase switch 26v and W-phase switch 26w. Theswitches first drive unit 22B to theU-phase driver 27u, the V-phase driver 27v and the W-phase driver 27w respectively of thedrive unit 27 until the switching signal S is produced. Upon production of the switching signal S, the H/L (REC) signal is supplied to theU-phase driver 27u via theU-phase switch 26u so as to issue signals of PU, NU while the PWM signal is supplied to the V-phase driver 27v and the W-phase driver 27w via the V-phase switch 26v and the W-phase switch 26w so as to issue signals PV, NV and signals PW, NW. The signals PU, NU; PV, NV; PW, NW respectively constitute the drive signal IB. TheU-phase driver 27u, the V-phase driver 27v and the W-phase driver 27W respectively receive the H/L signal as ON/OFF signal so that each driver does not issue any signal in the case where the H/L signal is at an L level. - The waveforms showing voltages Vu, Vv, Vw (potentials at imaginary neutral point corresponding to a middle point of the serially connected resistors R1, R2 as shown in a broken line in Fig. 1) of the output terminals of the main circuit of the
inverter 13 are illustrated in Fig. 6 in the case where the contact Saw of theswitch 12A is closed while each of theswitches signal switching unit 26 is switched to the side of thefirst drive unit 22B. A waveform as denoted at Vu-V (=Vu-W) is the one at the maximum output of the line-to-line voltage between the outputs v, w which are short-circuited. Designated at E is an input voltage of themain circuit 13 of theinverter 13 and the hatched portion shows high impedance state. - With the arrangement of the engine driven generator, an operation of the engine driven generator will be described herewith.
- First, the
switching unit 12A and the contact Saw of theswitch 12B are open while the contacts Sbu, Sbv of theswitch 12B are closed so that output terminals u, v, w of the main circuit of theinverter 13 are connected to thearmature windings generator 3. Theactuation switch 17 is turned on to supply the directcurrent power 15 to the main circuit of theinverter 13 while the main circuit of theinverter 13 receives a base signal IB supplied from thedriver first drive unit 22B and is actuated. The main circuit of theinverter 13 converts the direct current power of the directcurrent power source 15 to the three-phase alternating current voltages U, V, W having frequencies in synchronism with the speed of rotation N of thegenerator 3 and supplies it to thegenerator 3 whereby thegenerator 3 effects motor driving operation to actuate the engine 1. That is, therotor position detector 10 and the main circuit of theinverter 13 correspond respectively to a brush and a commutator of DC motor and thegenerator 3 effects the motor driving operation to actuate the engine 1 as a starter. - The speed of rotation N of the
generator 3 is increased with the lapse of time after actuation of the engine 1 and reaches the predetermined speed No. At that time, the engine 1 completes the actuation thereof and theactuation completion detector 21 of thecontrol circuit 19 issues the switching signal S so that theswitch 12A and the contact Saw of theswitch 12B are closed while the contacts Sbu, Sbv of theswitch 12B are open whereby the output terminals u, v are short-circuited and connected to the terminals (loads) of the outer device. At the same time thesignal switching unit 26 is switched. - With the series of operations set forth above, the
generator 3 starts to effect power generation operation. The voltage generated by thegenerator 3 is converted to direct current by the full-wave rectifier 11 and smoothed by thecapacitor 14, the smoothed direct current power is supplied to the main circuit of theinverter 13. The main circuit of theinverter 13 effects inverting operation on the reception of the base drive signal IB supplied by theU-phase driver 27u, V-phase driver 27v, W-phase driver 27w on the basis of the signal produced by thesecond drive unit 22A, namely, by the H/L signal and the PWM signal. Since theU-phase driver 27u receives the H/L signal the transistors TPU, TNU are turned on or off in synchronism with the H/L signal while the transistors TPV, TNV effect PWM operation during the period of H-level of the H/L signal and rest at the other half cycle, and the transistors TPW, TNW effect PWM operation during the period of L-level of the H/L signal and rest at the other half cycle. That is, a pair of the transistors TPV, TNV and a pair of the transistors TPW and TNW are alternately driven each half cycle of the basic wave with time sharing. - A transistor dissipation is classfied generally to a normal dissipation L1 at an on-state and a transient dissipation (switching dissipation) L2 at the time of switching. During the PWM operation at several KHz the normal dissipation L1 and the transisent dissipation L2 are in the ratio of 1:1. During the operation at a low frequency (at the time of operation of the U-phase transistors TPU, TPU) the normal dissipation L1 occupies substantially 100 % of the whole dissipation.
-
- Assuming that no alternate time sharing operation is carried out to rest the transistors TPW, TNW completely while U-phase transistors TPU, TNU are driven by H/L signal and the V -phase transistors TPV, TNV are successively subjected to the PWM operation, the dissipation of V-phase transistors TPV, TNV will be
which shows that the dissipation is two times of the present embodiment. Provided that the capacity of the transistors is same and assuming that the dissipation equals to ratio of load, then the relationship between three-phases, namely, U-phase : V-phase : W-phase = 1 : 2 : 0. As a result, a sharing of each phase transistor is not balanced while the relationship between three-phases according to the present embodiment is balanced, namely, U-phase : V-phase : W-phase = 1 : 1 : 1. - Hence, according to the present embodiment, assuming that the capacity of the main circuit of the
inverter 13 is same, compared with the case where the transistor corresponding to one-phase rests, for example, in the case where the W-phase transistors TPW, TNW, rest completely, it is possible to supply a single-phase alternating current having output of two times. On the other hand, assuming that the output value of the single-phase alternating current is same, for example, compared with the case where the W-phase transistors TPW, TNW rest completely the capacity of the main circuit of theinverter 13 will be reduced to half which results in allowing the device to be small sized. - According to the present embodiment, although the ON/OFF timing of the U-phase transistors TPU, TNU is synchronous with the operation switching timing of the transistors TPV, TNV and the transistors TPW, TNW the operations of the V-phase transistors TPV, TNV and the W-phase transistors TPW, TNW may be shifted relative to the operations of U-phase transistors TPU, TNU, as shown in Fig. 7.
- Furthermore, according to the present embodiment the operations of V-phase transistors TPV, TNV, and the U-phase transistors TPU, TNU are alternated with phase angle of 180° radian, but they may be alternated with phase angles of 45°, 90°, 120° radians which have same effect as that of the phase angle of 180° radian. Hence, V-phase transistors TPV, TNV and the W-phase transistors TPW, TNW may be alternately operated with substantially 50 percent of time sharing.
- The
backflow prevention diode 16 is provided for preventing the current from flowing back since the voltage of thecapacitor 14 is automatically greater than that of the directcurrent power supply 15 after the actuation of the engine 1. - An engine driven generator according to the second embodiment of the present invention will described with referrence to Figs. 8 and 9.
- The engine driven generator comprises a
chopper circuit 30 for increasing the voltage of the directcurrent power supply 15 to be supplied to the main circuit of theinverter 3 in addition to the elements same as those of the first embodiment. Thechopper circuit 30 has achopper 31, areactor 32, and a chopper controller (not shown) provided at thecontrol circuit 19 for controlling the ON/OFF period where the direct current obtained by rectification of the output voltage of the main circuit of theinverter 13 is supplied to thechopper 31 as a feedback signal. Thechopper circuit 30 has an operation characteristic as illustrated in Fig. 9. In Fig. 9 designated at Eo is the voltage of the directcurrent power supply 15, Ec is the voltage of thecapacitor 14. - An engine driven generator according to the second embodiment of the present invention will described with reference to Figs. 10 and 11.
- In the
chopper circuit 30 for increasing the voltage inasmuch as the input voltage of the main circuit of theinverter 13 cannot be decreased under the voltage value of the directcurrent power supply 15 as illustrated in Fig. 9, the speed of rotation of thegenerator 3 is small when thegenerator 3 is just actuated so that an excessive current will flow through the main circuit of theinverter 13 when the speed induction voltage is low. To prevent the flowing of the excessive current, thechopper circuit 30A for increasing the voltage may be provided as illustrated in Fig. 10. Thechopper circuit 30A comprises achopper 31A (a transistor in this embodiment),reactor 32A, and a chopper controller (not shown) provided at thecontrol circuit 19 for controlling the O N/OFF period where the direct current obtained by rectification of the output voltage of the main circuit of theinverter 13 is supplied to thechopper 31A as a feedback signal. Thechopper circuit 30A decreases the voltage provided that the O N period of thetransistor 31 is shortened, while thechopper circuit 30A increases the voltage provided that the ON period of thetransistor 31 is prolonged. An operation characteristic of thechopper circuit 30A for increasing and decreasing the voltage is illustrated in Fig. 11, designated at Eo is the voltage of the directcurrent power supply 15, Ec is the voltage of thecapacitor 14. - An engine driven generator according to a fourth embodiment of the present invention will be described to with referrence to Fig. 12.
- The engine driven generator of the fourth embodiment is different from that of the second embodiment as illustrated in Fig. 8 in respect that the
element 33 for charging the battery (a transistor in this embodiment). A charging controller is provided at the control circuit 19 (not shown) for controlling thetransistor 33 to thereby supplying an ON signal from the charging controller at the time when the switching signal S is issued. There is provided a backflow prevention diode D4. The charging means or elements can be employed in the engine driven generator of the second embodiment. Each embodiment has thesignal switching unit 26 having contacts but having gate logic switch actually mounted instead of contacts. - The
control circuit 19 is illustrated as analog structure but may be digital structure. The operation of the main circuit of theinverter 13 can be executed by a software. The control system in each embodiment can be employed to an engine driven generator having a main circuit other than the main circuit of theinverter 13. - The
generator 3 employed in the first embodiment is the three-phase synchronous generator and the main circuit of theinverter 13 is the three-phase inverter. However, the engine driven generator according to the fifth embodiment of the present invention can be used as the three-phase generator by changing the control system. - When using as the three-phase generator, the switching
unit 12 of the first embodiment may be substituted by the three-phase switching unit as illustrated in Fig. 13 while thesecond drive unit 22A of the first embodiment may be substituted by asecond drive unit 22C for producing a PMW signal for supplying to aU-phase driver 27u, V-phase driver 27v, W-phase driver 27w respectively of adriver unit 27. Thecontact 12A of the switchingunit 12 has three normally open contacts Sau, Sav, Saw while thecontact 12B has three normally closed contacts Sbu, Sbv, Sbw. Designated in Fig. 15 at 23u, 23v, 23w are respectively signal generators shifted for 120° inphase angle control circuit 19. - With the arrangement of the engine driven generator accoring to the fourth embodiment of the present invention, the
rotor position detector 10 and the main circuit of theinverter 13 operate corresponding to the brush and the armature of the direct current motor while three-phasesynchronous generator 3 carries out the motor driving operation to actuate the engine 1. Actual completion of the actuation of the engine 1, thesynchronous generator 3 carries out a generating operation and the alternating current output is converted by the main circuit of theinverter 13 to a stable three-phase alternating current power having a predetermined voltage with a predetermined frequency. - As is evident from the explanation, the engine driven generator according to the first to the fourth embodiments, a mere change of the switching
unit 12 as well as change of the second drive unit of thecontrol circuit 19 to thereby change the control system such as substitution of a printer circuit enables to be employed as the three-phase generator as well as the single-phase generator. Additionally, inasmuch as the bridge circuit composed of the transistor of the same capacity constituting the main circuit of theinverter 13 is general, and moduled and available with module and low cost, the engine driven generator can be mass-produced. Furthermore, the constituents excluding the engine the synchronous generator are very simple, the engine driven generator can be realized with low cost, light weight, and compact size. - The direct current power supply, namely, the direct current power supply having the
chopper circuit 30 for increasing the voltage, the directcurrent power supply 30A for increasing and decreasing the voltage, the direct current power supply having thebattery charging element 33 respectively illustrated in Figs. 8, 10, 12 can be employed to the engine driven generator of the fifth embodiment. - As explained in detail hereabove it is possible to provide the engine driven generator having no exclusive starter with simple construction so that the engine driven generator becomes small sized, compact with easy maintenace thereof. In the case where the single-phase alternating current is produced, one-phase of the switching element of the main circuit of the inverter for converting the output of the generator into the voltage having a predetermined voltage with a predetermined frequency is subjected to successively low frequency switching operation while the other two-phase switching elements are subjected to a high frequency switching operation alternately each half cycle whereby the main circuit can be operated with an optimum conversion efficiency at the motor driving operation of both the single-phase generator and the three-phase generator to thereby increase remarkably the single-phase alternating current capacity and to reduce the cost thereof.
Claims (6)
- An engine driven generator having no exclusive starter comprising:
an engine (1);
a synchronous generator (3) having a rotor and coupled to a shaft of the engine (1);
a rotor position detector for detecting the position of the rotor of the synchronous generator (3);
a full-wave rectifier (11) connected to the output of the synchronous generator (3) for rectifying an alternating current wave of the output thereof;
a main circuit of a direct current/alternating current power converter (13) (hereafter referred to as inverter) having switching elements and connectable to the output of the synchronous generator (3);
a direct current power supply (15) connected to the main circuit of the inverter (13) for supplying the power to actuate the engine (1);
a switching unit (12) composed of a first switch (12A) and a second switch (12B), the first switch (12A) capable of connecting the output of the main circuit of the inverter (13) for supplying the output thereof to a load while the second switch (12B) is capable of connecting the outputs of the main circuit of the inverter (13) with the output of the synchronous generator (3); and
a control circuit (19) connectable to the direct current power supply (15) for switching the first and second switches (12A, 12B) and controlling the switching elements of the main circuit of the inverter (13);
characterized in that
the direct current power supply (15) has a semiconductor device (16) for preventing the current from flowing back,
the full-wave rectifier (11) supplies rectified generator power to the dc input of the inverter (13);
the first switch (12A) connects the ac load to the inverter (13) when the generator (3) performs power generation, and disconnects the load when the generator (3) performs motor driving operation; and
the second switch (12A, 12B) is so controlled that the generator (3) is connected to the inverter (13) when the generator (3) is driven as motor, and disconnected from the inverter (13) when the generator (3) supplies three-phase ac power through the above mentioned full-wave rectifier (11) and the inverter (13) to the ac load. - An engine driven generator according to claim 1, wherein the generator (3) is a three-phase synchronous generator (3), which performs the power generating operation after completing the actuation of the engine (1), a pair of positive and negative first single-phase switching elements are subjected to successive ON/OFF control operation while one pair of two-phase switching elements and the other pair of two-phase switching elements are alternated for each half of the time and subjected to PWM control operation so that output terminals corresponding to the two-phase switching elements are short-circuited with each other;
the connection point between the first pair of positive and negative switching elements is connected to one phase of an ac load;
a contact (Saw) of the second switch (12B) short-circuits the connection points of the other two pairs when the generator performs power generation; and
the thus connected connection points are connected to the other phase of the ac load. - An engine driven generator according to claim 2, wherein the pair of positive and negative first single-phase switching elements are driven by a square wave signal while the other each pair of two-phase switching elements are driven by a PWM signal which is derived from a half wave of a sine wave, and is alternated each half cycle.
- An engine driven generator according to claims 1 through 3, wherein a direct current power supply (15) for actuating the engine (1) is a battery interposed between the direct current terminals of the main circuit of the inverter (13) via the switching element (17), the switching element (17) is not turned on while the engine is actuated.
- An engine driven generator according to claims 1 through 4, wherein the direct current power supply (15) comprises a battery and a chopper for increasing the voltage of the battery.
- An engine driven generator according to claims 1 through 4, wherein the direct current power supply (15) comprises a battery and a chopper for increasing and decreasing the voltage of the battery.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP94553/88 | 1988-04-19 | ||
JP9455388 | 1988-04-19 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0338512A2 EP0338512A2 (en) | 1989-10-25 |
EP0338512A3 EP0338512A3 (en) | 1990-08-01 |
EP0338512B1 true EP0338512B1 (en) | 1994-09-21 |
Family
ID=14113504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89106938A Expired - Lifetime EP0338512B1 (en) | 1988-04-19 | 1989-04-18 | Engine driven generator |
Country Status (3)
Country | Link |
---|---|
US (1) | US5065086A (en) |
EP (1) | EP0338512B1 (en) |
DE (1) | DE68918321T2 (en) |
Cited By (5)
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US7180200B2 (en) | 2002-06-06 | 2007-02-20 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US7309928B2 (en) | 2002-06-06 | 2007-12-18 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US7687926B2 (en) | 2002-06-06 | 2010-03-30 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US7989969B2 (en) | 2002-06-06 | 2011-08-02 | Black & Decker Inc. | Universal power tool battery pack coupled to a portable internal combustion engine |
US8319357B2 (en) | 2002-06-06 | 2012-11-27 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
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JPH0734679B2 (en) * | 1989-01-18 | 1995-04-12 | 株式会社日立製作所 | Dual power supply for vehicle |
JP2971568B2 (en) * | 1990-11-30 | 1999-11-08 | 神鋼電機株式会社 | Engine power generator |
US5272379A (en) * | 1991-09-26 | 1993-12-21 | Mitsubishi Denki K.K. | Power supply device for an electric vehicle |
US5406189A (en) * | 1992-12-08 | 1995-04-11 | Alliedsignal Inc. | Low input harmonic induced multiple use AC synchronous generator starter converter |
WO1995002758A1 (en) * | 1993-07-15 | 1995-01-26 | Onan Corporation | Auxiliary power system for hybrid electric vehicle |
JP3374491B2 (en) * | 1993-12-24 | 2003-02-04 | 株式会社デンソー | Electric generator for vehicle |
US5493201A (en) * | 1994-11-15 | 1996-02-20 | Sundstrand Corporation | Starter/generator system and method utilizing a low voltage source |
WO1997022176A1 (en) * | 1995-12-12 | 1997-06-19 | Solar Turbines Incorporated | Starter system for a direct drive generator |
CA2273944C (en) * | 1996-12-03 | 2004-07-06 | Elliott Energy Systems, Inc. | Electrical system for turbine/alternator on common shaft |
US6938713B1 (en) * | 1999-09-20 | 2005-09-06 | Hitachi, Ltd. | Dynamotor of hybrid vehicle, and method of control thereof |
JP4460708B2 (en) * | 2000-03-29 | 2010-05-12 | 株式会社東芝 | Permanent magnet motor control device that combines engine starter and generator |
US6445079B1 (en) * | 2001-01-20 | 2002-09-03 | Ford Global Technologies, Inc. | Method and apparatus for controlling an induction machine |
US7102331B2 (en) * | 2003-01-17 | 2006-09-05 | Black & Decker Inc. | Generator with dual cycloconverter for 120/240 VAC operation |
US7161253B2 (en) * | 2003-08-06 | 2007-01-09 | Briggs & Stratton Corporation | Portable power source |
US7009311B1 (en) * | 2004-08-24 | 2006-03-07 | Delphi Technologies, Inc. | Method for minimizing generator load on internal combustion engine |
US7782626B2 (en) | 2007-02-02 | 2010-08-24 | Black & Decker Inc. | Portable power driven system with battery anti-theft apparatus |
IT1391650B1 (en) | 2008-07-30 | 2012-01-17 | C R D Ct Ricerche Ducati Trento S R L | INTEGRATED TIMING SYSTEM FOR SYNCHRONOUS ELECTRIC MACHINE COMBINED WITH ENDOTHERMAL MOTOR AND RELATIVE METHOD |
IT1391446B1 (en) * | 2008-12-09 | 2011-12-23 | C R D Ct Ricerche Ducati Trento S R L | METHOD AND EQUIPMENT FOR THE CONTROL OF A HYBRID-SERIES ELECTRIC VEHICLE. |
JP6301240B2 (en) * | 2014-02-07 | 2018-03-28 | 本田技研工業株式会社 | Battery charger for vehicle |
JP6933859B2 (en) * | 2016-02-11 | 2021-09-08 | セデマック メカトロニクス プライベート リミテッド | Integrated Starter-Dynamo Control Method and System |
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US4119861A (en) * | 1975-10-15 | 1978-10-10 | Tokyo Shibaura Electric Company, Ltd. | Starting apparatus for gas turbine-generator mounted on electric motor driven motorcar |
US4330743A (en) * | 1980-07-17 | 1982-05-18 | Sundstrand Corporation | Electrical aircraft engine start and generating system |
US4786852A (en) * | 1986-07-18 | 1988-11-22 | Sundstrand Corporation | Inverter operated turbine engine starting system |
FR2604041B1 (en) * | 1986-09-11 | 1988-10-28 | Valeo | METHOD FOR CONTROLLING A REVERSIBLE GENERATOR-MOTOR ELECTRIC MACHINE FOR A MOTOR VEHICLE, AND CONTROL UNIT FOR IMPLEMENTING SUCH A METHOD |
JPS6430500A (en) * | 1987-07-24 | 1989-02-01 | Shinko Electric Co Ltd | Brushless starting generator exciter |
-
1989
- 1989-04-18 DE DE68918321T patent/DE68918321T2/en not_active Expired - Fee Related
- 1989-04-18 US US07/339,990 patent/US5065086A/en not_active Expired - Fee Related
- 1989-04-18 EP EP89106938A patent/EP0338512B1/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US7180200B2 (en) | 2002-06-06 | 2007-02-20 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US7309928B2 (en) | 2002-06-06 | 2007-12-18 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US7687926B2 (en) | 2002-06-06 | 2010-03-30 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US7989969B2 (en) | 2002-06-06 | 2011-08-02 | Black & Decker Inc. | Universal power tool battery pack coupled to a portable internal combustion engine |
US8319357B2 (en) | 2002-06-06 | 2012-11-27 | Black & Decker Inc. | Starter system for portable internal combustion engine electric generators using a portable universal battery pack |
US8759991B2 (en) | 2002-06-06 | 2014-06-24 | Black & Decker Inc. | Universal power tool battery pack coupled to a portable internal combustion engine |
US9276438B2 (en) | 2002-06-06 | 2016-03-01 | Black & Decker Inc. | Universal power tool battery pack coupled to a portable internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
DE68918321T2 (en) | 1995-01-19 |
US5065086A (en) | 1991-11-12 |
EP0338512A2 (en) | 1989-10-25 |
EP0338512A3 (en) | 1990-08-01 |
DE68918321D1 (en) | 1994-10-27 |
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